中国西部三大盆地海相碳酸盐岩台地边缘类型及特征

Types and characteristics of carbonate platform margins of marine carbonate rock in three major basins in western China

在回顾经典的碳酸盐沉积模式类型研究和我国学者对碳酸盐岩台地边缘特征研究的基础上,以构造控盆、盆地控相、相控生储盖组合为指导思想,依据中国西部三大海相盆地碳酸盐岩发育的特殊性,从中国西部三大盆地海相碳酸盐岩发育特征和地质实际情况出发,系统建立了5种碳酸盐岩台地边缘类型及沉积模式和12种亚类类型。以中国西部三大盆地不同时期发育的碳酸盐沉积特征为主线,从盆地构造演化、岩性特征、相带变化以及模式演化等方面详细分析了各个碳酸盐岩台地边缘类型及沉积模式特征。不同类型台地边缘及其沉积模式演化特征研究对分析生烃、储烃和盖烃物质等油气要素的时间和空间匹配关系具有重要的指导意义。

Based on classic carbonate depositional mode studies and research by Chinese scholars on the characteristics of the carbonate platform margin, previous research into the characteristics of the carbonate platform margin is summarized according to the particularity of carbonate rocks of the three marine basins in western China, taking available classic mode into consideration. In light of the developmental characteristics of carbonate rocks and the actual geological situation of three basins in western China, five kinds of carbonate depositional modes and 12 subclass types are systematically established. Based on the carbonate sedimentary features developed in the three basins at different periods, this paper gives a detailed analysis on the characteristics of the various types of carbonate platform margins and their depositional modes in terms of tectonic evolution, lithological characteristics, sedimentary facies changes, and sedimentary mode development. The different types of carbonate platform margins and their evolutionary characteristics of depositional patterns are of critical significance in guiding the analysis of time-space matching relationship of elements such as hydrocarbon generation, reservation, and sealing.